Boston's institutional model, UP-118S Performance Edition, is perfect for any music room and features double-rubber casters for ease of movement — and locks for the top and fallboard. Height: 46½" (118 cm)

Features and Benefits

Boston uprights offer the same standards of excellence which characterize all instruments designed by Steinway & Sons. A Boston upright will give you the same opportunities to express your musical skill as a grand.

In comparison to other pianos, the Boston has less string tension. This reduced string tension allows for a larger, tapered soundboard, creating longer sustain, and more singing quality in the tone (as well as longer piano life). A wealth of other engineering enhancements, including optimal placement of ribs, braces, and bridges, also contribute to the Boston’s superior tone and greater stability.

Each Boston piano soundboard is crafted of Sitka spruce, long proven to be the most resonant material available. Boston soundboards are also precisely tapered, which allows them to vibrate more freely. In conjunction with a number of special technologies — unique patents of Steinway & Sons — the result is a powerful, sustained tone.


Height: 118 cm (46½")
Width: 151 cm (59¼")
Depth: 58 cm (22¾")
Net Weight: 218 kg (480 lb)


Natural finishes over veneers of American Oak or Walnut and African Mahogany.

Satin: Mahogany, Black Oak

Solid brass - polished and lacquered.

Cabinet Style

Technical Specifications

Mahogany foot-piece soundboard lining and backboard. Specially-designed grand-type mahogany closing rim; unequaled vertical strength and stability and improved acoustics. Backposts have staggered spacing to enhance tone and provide support where needed.

Full-length laminated mahogany posts assure that the backframe will remain straight and consistent and tuning will remain stable. Mahogany fill-blocks between posts at the top and bottom of the backframe, capped with a mahogany backboard for positive vertical alignment. Solid filler blocks (no hollow spots). 5 posts. Total cross sectional area: 240 cm2 (37.2 in2). Thickness of post: 6 cm (2⅜"). Width of post: 8 cm (3⅛").

Octagrip™ pinblock made of 11 layers of hard rock maple – glued in different grain angles of 60 degrees – affording the tuning pins greater stability under tension and enabling the piano to stay in tune longer.

Close and straight-grain solid (not laminated) Sitka spruce. Minimum 3 annual growth rings per cm (minimum 8 per inch). Tapered from treble to bass, to provide a rich tone in the bass, and a brilliant and crisp tone in the treble, creating a well-balanced and lasting tonal response. Tapered from 9 mm to 8 mm. Vibrating area: 1.11 m2 (1,721 in2). Closing rim evens out the soundboard’s response to all frequencies, eliminating “hot” spots. Emulates shape of grand soundboard.

Made from durable spruce to assure strong and constant support of the strings bearing down on the soundboard. Ribs are fully let-in to the liner to support the important soundboard crown and prevent the piano from losing its tone. Number of ribs: 10

Treble: Solid maple, curved to fit the crown of the soundboard. Bass: Solid maple mounted to cantilevered base. Doweled, glued, and screwed to soundboard. One continuous base and treble bridge.

Overstrung: Lower tension scale for longer sustaining tone and longer life of the whole piano. 17,425 kg (38,415 lb) tension.

Cast from grey iron, bronze-painted and lacquered. Vacuum cast.
Tuning Pins Nickel-plated steel, cut threaded.

Treble: Highest grade steel (in half size increments). Number of sizes: 14. Lowest tenor note: 28. Bass: Steel core wire wound with solid copper. Number 1 speaking length: 115.0 cm (45.3")

Premium wool topfelt over premium wool underfelt. Weight of topfelt: 9.4 kg (20.8 lb). Compression-wired to retain permanent shape. Mahogany moldings. Hammer-shanks from select resilient maple or horn-beam. Computer-designed pear-shaped hammers with reinforced shoulders result in superior tone, increased durability and greater voicing ability.

Solid maple (all wood, no plastic) for all moving parts. Extruded aluminum action rails for increased stability and less frequent regulation. Dependable direct-blow design.

Genuine spruce, individually balanced and weighted. Phenolic sharps and acrylate white key covers. Length of key: 34.8 cm (13.7").
Keybed Made from laminated hardwood. Strong, rugged construction provides a solid mount for the keyframe and action allowing for precise and prolonged action regulation. Keybed thickness is 42 mm.

Spruce with hardwood inserts in the balance rail and front rail for added stability.

Heavy solid castings. Soft (half-blow), damper (sustaining), and bass sustaining.

Music desk: Professional solid music desk. Casters: Double rubber casters. Locks: Fallboard and top locks. Prop Sticks: Top prop sticks. Bench: Matching wood-top bench.

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